Josh Rosen created SPARK-20776:
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Summary: Fix performance problems in TaskMetrics.nameToAccums map
initialization
Key: SPARK-20776
URL: https://issues.apache.org/jira/browse/SPARK-20776
Project: Spark
Issue Type: Improvement
Components: Spark Core
Affects Versions: 2.2.0
Reporter: Josh Rosen
Assignee: Josh Rosen
Attachments: screenshot-1.png
In
{code}
./bin/spark-shell --master=local[64]
{code}
I ran
{code}
sc.parallelize(1 to 100000, 100000).count()
{code}
and profiled the time spend in the LiveListenerBus event processing thread. I
discovered that the majority of the time was being spent initializing the
{{TaskMetrics.nameToAccums}} map (see attached screenshot). By replacing the
use of Scala's LinkedHashMap with a pre-sized Java hashmap I was able to remove
this bottleneck and prevent dropped listener events.
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